Release 1.5.21 made from main

Release 1.5.20 from main

Release 1.5.19 from main

Release 1.5.18 from main

Release 1.5.17 from main

Release 1.5.16 from main

Release 1.5.15 from main

Release 1.5.14 from main

[maven-release-plugin] copy for tag release-1.5.12

svn path=/search/tags/release-1.5.12/; revision=56721; tag=v1.5.12

[maven-release-plugin] copy for tag release-1.5.11

svn path=/search/tags/release-1.5.11/; revision=55729; tag=v1.5.11